Remove #pragma once from chrome/browser/extensions

chrome/browser/extensions/external_extension_loader.h

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_EXTENSIONS_EXTERNAL_EXTENSION_LOADER_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTERNAL_EXTENSION_LOADER_H_
-#pragma once
 
 #include "base/file_path.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 
 class ExternalExtensionProviderImpl;
 
 namespace base {
 class DictionaryValue;
 }
@@ skipping 55 matching lines @@
   ExternalExtensionProviderImpl* owner_;  // weak
 
   // Set to true if loading the extensions is already running. New requests
   // are ignored while this is set true.
   bool running_;
 
   DISALLOW_COPY_AND_ASSIGN(ExternalExtensionLoader);
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTERNAL_EXTENSION_LOADER_H_